A Metallic (EDT-DSDTFVSDS)2·FeBr4 Salt: Antiferromagnetic Ordering of d Spins of FeBr4- Ions and Anomalous Magnetoresistance Due to Preferential

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• 作者：Toshiki Hayashi ; Xunwen Xiao ; Hideki Fujiwara ; Toyonari Sugimoto ; Hiroyuki Nakazumi ; Satoru Noguchi ; Tsutomu Fujimoto ; Syuma Yasuzuka ; Harukazu Yoshino ; Keizo Murata ; Takehiko Mori ; Hiroko Aruga-Katori
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：September 13, 2006
• 年：2006
• 卷：128
• 期：36
• 页码：11746 - 11747
• 全文大小：99K
• 年卷期：v.128,no.36(September 13, 2006)
• ISSN：1520-5126

文摘

The 2:1 salt of a new donor molecule, EDT-DSDTFVSDS with FeBr₄^- ion, (EDT-DSDTFVSDS)₂·FeBr₄ showed an essentially metallic behavior despite a small upturn in the electrical resistance below ca. 30 K (electrical conductivities at 290 and 4.2 K are 200 and 170 S cm^-1, respectively). The Fe(III) d spins of the FeBr₄^- ions in this salt were subject to antiferromagnetic ordering at 3.3 K by virtue of a strong -d interaction (J_d) which is comparable to that in a molecular metallic conductor, -(BETS)₂·FeCl₄, and of a very weak d-d interaction (J_dd). This strong -d interaction was evidenced by a large and negative magnetoresistance effect (ca. 20% at 5 T) as well as by the appearance of a large dip in the resistance at the magnetic field (ca. 2.0 T) parallel to the easy axis for the spin-flop transition of the Fe(III) d spins.